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Re: [libvirt] [PATCH 0/3] Transport network port data during live migration



On Sep 30, 2012, at 9:44 AM, Laine Stump wrote:
> On 09/28/2012 03:58 PM, Kyle Mestery (kmestery) wrote:
>> As an example, an OpenFlow controller may have certain information about the
>> port, specific to this controller, which it may want to store with the port itself on the
>> host. This especially true if an agent exists on the host which needs to read this data,
>> update it, and use it to perform some tasks. It's convenient to have this data stored
>> as close to the port itself, which in this case is the OVS DB, and having it transferred
>> as part of the migration protocol is also very handy.
>> 
> 
> But how big is it, and what does it look like? (I assume it's all
> printable ASCII, since you're getting it as the output of a shell command)
> 
> If it's *really* large, possibly it would go better as a subelement of
> <interface>, rather than an attribute, i.e.:
> 
>   <interface index='1' vporttype='openvswitch'>
>     <portdata>
>     blah blah blah blah
>     </portdata>
>   </interface>


Yes. it's all printable ASCII. I think at the largest, it's possible for it to be up to a few K (e.g. 2-4K
or so). So perhaps making it a subelement would be the way to go.

As for an example, let me talk to some controller people and see if I can scrounge one up.

Thanks,
Kyle


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